You just need a text editor. That said, it's not terribly hard, but if you're not experienced with scripting/html it might be more than you want to attempt.

I don't think that I would know how to do this. It looks confusing.
I am wondering why this latest version is having trouble converting htm to LRF. When I use the fanfiction downlaoder I save it as html and it works fine with that. The only problem it has is when download from a web browser. I think I might have to just uninstall this version and go back to the older version I had.